new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/542605-hidden-unscrollable-ref.xul
@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<somenode xmlns:html="http://www.w3.org/1999/xhtml" 
+	style="overflow: -moz-hidden-unscrollable;"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+	<html:input  value="lime"/>
+        <button  label="Credits" accesskey="C"/>
+</somenode>
+

new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/542605-hidden-unscrollable.xul
@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+<somenode xmlns:html="http://www.w3.org/1999/xhtml" 
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+	<html:input  value="lime"/>
+	<!--
+	a clipping problem in the cairo-win32 show-glyphs
+	implementation was causing the text on the button
+	to be clipped out. The clip was null and we weren't
+	reseting the clip causing us to use the clip of the
+	input element. Not using -moz-hidden-unscrollable
+	causes this problem to show up for reasons unknown.
+	-->
+        <button  label="Credits" accesskey="C"/>
+</somenode>

--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -1407,16 +1407,17 @@ fails HTTP(..) == 518172-2b.html 518172-
 == 538909-1.html 538909-1-ref.html
 == 538935-1.html 538935-1-ref.html
 == 539226-1.html about:blank
 == 539323-1.html 539323-1-ref.html
 == 539323-2.html 539323-2-ref.html
 == 539323-3.html 539323-3-ref.html
 == 541382-1.html 541382-1-ref.html
 random-if(!haveTestPlugin) == 541406-1.html 541406-1-ref.html
+== 542605-hidden-unscrollable.xul 542605-hidden-unscrollable-ref.xul
 == 542620-1.html 542620-1-ref.html
 == 545049-1.html 545049-1-ref.html
 == 546033-1.html 546033-1-ref.html
 random-if(!haveTestPlugin) == 546071-1.html 546071-1-ref.html
 == 549184-1.html 549184-1-ref.html
 == 550716-1.html 550716-1-ref.html
 == 551463-1.html 551463-1-ref.html
 == 551699-1.html 551699-1-ref.html